Overview

The Hitachi fluidized bed biological treatment system is a treatment system that combines a fluidized bed that lets special carriers flow in the treatment tank with a contact oxidation tank for finishing. The system's highly activated biological membrane forms on the surface of the carriers and provides stable treated water. This method is effective for fast-multiplying microorganisms like bacteria that break down BOD.

Features

Highly concentrated biological treatment is possible

BOD concentration in raw water: 30-5,000 mg/L

BOD volume load: 1-2 kg-BOD/m³ /day

Conserves space

Our system can maintain high sludge concentration inside the biological treatment tank, which reduces the space needed for traditional facilities by about half.

Maintenance is easy

The amount of sludge generated can be reduced.

Can be applied as a modification

This system can be applied as a modification to existing biological treatment equipment.

Comparison of activated sludge methods

Activated sludge method
(Suspended type)

Fluidized bed
Biological treatment system

BOD load

0.5 kg/m³/day

1.0-2.0 kg/m³/day

Amount of air for aeration

100%

75%

Equipment cost

100%

95%

Operating cost

100%

80%

(in-house comparison)

System

Fluidized bed biological treatment system and carriers where microorganisms adhere